Contra-piston brake for motor vehicles



x pel objee to' feet for the veninohile which niey Speccetion of ieriers Patent.

l, fm Egea o Patented Ania e, i922.,

ipioeion 'ile. September 24., 192i. Serial io. 502,912.

To wil 'whom 'it wwmg/ ooncernf Be it lniownihei; l1, ANTON HULQMANN, e citizen oi Germany;a residing at Sen Frenoieco, in'zhe Cooney' of Sen Francisco and Sietev of eli'iornie, here invented new sind useful iinprovenienis in lConre- Piston `r ,Brakes for Motor Vehicles, or which the i -following is e specicotion.

This invention rel-rites to an improved brake for automobiles end has for its princi- Vrovide niesins which may he reliedA upon indeiiiendently of the Wheel brakes for reali?" e positive braking of f Lld thus assure en ehsolnte control. oi fthe vehioie under lie nios; severe-"conditions, euch for instenee :is de# :ending steep grades where iieiliire oi the wheel brake would prove intel.

Another object v'or' this invention is to 4so 'construct the braking device that ii varie tion o the braking eiect may be obtained by the ,driver in a eonvenieni and practical manner, without dii-nger oi burning ille brake hands the device having wider range oli positive loriilie ed'jus'enient than the ordin nary Wheel brakes.

A 'further object of this invention is to produce uv device ofthe character described which is economical iso manufacture, easy io operate, readily epplirehle to various ei/pee oi' motor vehicles Wihout inuerielly iii'i'erthe construction of the seine, und ey device which is 'positive in operiiion and highly eiiicien't in use @ther objeos end advanioges will he zipporent. during?7A the course oi' the follov.f'inr description. l `ln the accompanying drawings forming e part of this specification und in which like numerals employed o designaie like parts'ihroughout the saine,

Fig. l is :i Side View of the power of en automobile Showing my braking device es applierh Fig, 2 is zi View the mejor parte of my in longitudinal section of device,

v Fig. 3 is :i cross section .on the line 2%-3 oi Figure 2` end Fig, 4 is e. Cross Figure 2. I

in the :icconipiinying drawings wherein for theipurpose of illustration is shown a preferred embodiment oi' my invention., the numeral l represente the engine of en eurohiivo any nuniher of vonventional (-)jlixulcrs` but it is io he understood section onthe line l-#l of plant *eheh my device ie used in direct conneeion Wirli only one oiY the cylinders. The numeral designaiee the dash board of the vehicle and the numeral `3 izhe instrument board. The flevices connected to either the top or eide of one oi the cylinders oy the pipe connection Li, w ielris threaded io the nipple 5 of che cap G. T he interior oi the csi-p is hollowed out io leere i chamber 6 in communication with the bore in the nipple. The forward inerior is also hollowed with e valve seat 7 inode to receive a pepperV valve 8, the stein 9 of which extends horizontally throughthe sleeve 1G, he letter being errenged in the center oi the' closed end il of elle @up and surrounded hy e series oi smell openings l2, whieli ooinniuniciiie with ehe hollow oi" ihe oep sind the atmosphere. The valve siem extends beyond the end of the sleeve and has a nut i3 on its end with :i spring 14 around ne stein oeiweeri the nut and sleeve end acting to normally hold the elre heard en its sein', ae to closethe coinniunicatio/iibetween the opening and the connec'iioii #i in the Cylinder.

Threaded in 'he sido of the cap 6 is e heed 15 which has :i hreaded here inode to receive ihe plug 16.

This plug is provided wih :i bore l@ which is open et the end i8 of the plug, but

vclosed e@ the end il)t The plug' also includes e stom 2() which extends therethrough to the insruinent boord end erminiiies with e hand Wheel or the like 2l so that the driver niej.' turn iie'plug 16 to adjust the radial opening 22 roede in the side or the plug to regolare ille pori; aree of the opening 23 in the side of he heed. rThis opening in tnrn connects willi e flexible pipe which ein tends beneath the ver. which pipe Serves zo curry off any hissing noise occasioned during the opereion of the device.

The opereiion oi my device is :is Jfollows:

in descendino' i grade 'Ehe clutch is left in. end the hand wheel 2l is then unscrewed soiliei; the mire 3 will he unseeted. Then upon I:he suction erolre or" the pieton in the eylindor to which the device is applied, ille vulve heilig uneeeted, :i quantity of air will he sucked. inio the cylinder through the openings l2. Upon iihe compression stroke it will he discharged through the opening,l in the plugV and then into the pipi-ng 24. Bv regulatino` ille position of the opening' 22 relative to the opening' 2B the pori, iii-eri of this escape ior the airiney he so adjusted as to obtain the desired braking effect. `By chokingr oil' the escape the braking effect will be increased. When the device is te be held in an inoperative liosition the plug 16 is closed up until the end 18 abuts against the side of the valve which action cuts oli' the escape entirely and also holds the valve upon 'its seat.

From the foregoing description taken in connection with the accompanying drawing it will he apparent that this device when attached to one cylinder of the engine makes a contra-piston brake of said cylinder, the brakingr eiliect beingr readily accoml'ilished at the will of the operator. llVhen the braking elr'ect is not desired the cylinder works in the usual Way. For instance, in using` this dcvice more or less air is taken in with the first piston stroke and compression 'with the second stroke, and the driver has intake and compression under absolute control. Fur-y thermore, this brake will function in a wide range so that the machine to which it is applied can be readily slowed down or brought to acomplete stop. y

It is to be understood that the form ot' my invention, herewith shown and described is to be taken as a preferred example of the same, and that various changes in the shape, size and arrangement ol parts bere-- sorted to without departing 'from the spirit of the invention, or the scope of the subjoined claims.

HavingA thus described my invention, l claim:

l.. In a device otl the class described` a valve intake to the engine cylinder adapted to admit air into the cylinder upon the down 'stroke of the piston, and an adjustable outlet adapted to regulate the escape of air thus admitted, substantially as and for the purpose described.

2. ln a device of the class described, a valve intake to the engine cylinder adapted to admit air into the cylinder upon a down stroke of the piston and an adjustable outlet adapted to regulate the escape oli' air thus admitted, said a .l"ustable outlet including a screw plug and adapted to hold the valve of the intake upon its seat and to close the out4V let when the device is inactive.

3. In a device ot' the class described, a valve intake to the engine cylinder adai'ited to admit air into the cylinder upon the down stroke of the piston andan adjustable out" .with an opening adapted to register as an outlet opening in the side of the device, and means for regulating the relative adjustable positions of said opening.

4. In a device of the class described, a valved intake into the cylinder of an internal combustion engine adapted to admit air into the cylinder upon the'suction-stroke of the piston, and an adjustable outlet for the escape of air thus admitted upon the compression stroke of the piston, said outlet includ- 'ingr a screw pluier havingr a radial opening intermediate its ends adapted to register with an opening in a housing which confines the plugl, and means for moving the plug to i change the effective port arca of said openings to control the escape of air therethrough.

In a device of the class described, a valved intake into thel cylinder of an internal combustion engine adapted to' admit air into the cylinder upon the suction stroke of the piston, and an adjustable outlet for the escape of air thus admitted upon the compression stroke of the piston, s'aid outlet including a screw plug having a radial openingI intermediate its ends adapted to register with an opening' `in a housingwhich confines the plug, and means for moving the plugr to chang-e the effective port area of said openings to control the escape of air therethrough, said plut,r being mounted behind the valve and axially thereof and adapted to he moved in contact with the valve head to hold the saine inactive upon its seat to close the inlet well as the outlet.

6. A device of the class described and as set forth in claim 5 and in which the valve and the plug for the outlet are housed Within a hollow two part casting with the said parts having;` a threaded engagement one with ythe other to produce a combined housingr for the valve and plug. i

ln testimony' whereof I affix my signature.

ANTON HULSMANN. 

